As far as I can tell - Ixys seems to have a monopoly on the high voltage MOSFET market. Same goes for IGBTs. They can make parts up to 4KV.
Do they have any competitors? Or are they all on their own out there? And can anybody make higher voltage FETs? It seems like relays are the only option once you go past Ixys's offerings.
edit: also - can anybody suggest any tricks regarding ways of using a MOSFET past its breakdown voltage, if your load is very high impedance? In my case - I'm switching the low side of a load, where the high side is held at a high voltage. I was thinking you could put a resistor between the drain and low side of your load, so as to limit the energy that the supply can transfer to your load. Does that make sense? I have never looked into the exact mechanics of what is happening when you kill a MOSFET - so I'm a bit blind here!